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Fan running even with car off

Discussion in 'Model S: Interior & Exterior' started by AB4EJ, Jul 26, 2016.

  1. AB4EJ

    AB4EJ Member

    Feb 25, 2015
    Tuscaloosa, AL
    Like most of the rest of the continental US, it is hot here. I am in a location where I can't easily charge the car, so I have gone several days without charging. I noticed that 5 - 8 miles disappears off range every day even without driving the car. I happened to come out to the car (without the key fob),which is parked outside, and heard a fan running in the Model S. Since it is about 98 degrees in the shade, I'm thinking that some feature such as a battery cooling system is running to protect the battery against the high surrounding temperatures. I guess this is part of what is taking away some range (in addition to other vampire loads). Have others noticed this? I would think you would see this in places like AZ, if that it what it is.
  2. Gizmotoy

    Gizmotoy Active Member

    Sep 16, 2013
    Bay Area, CA
    The battery management system on the Model S is active and will keep the battery in the optimal range to preserve its lifetime. LiIon batteries degrade when hot, so the car is, as you speculated, likely periodically turning on the cooling system to bring battery temps back down.

    Notably, this is one of the reasons why Tesla suggests you keep the car plugged in when not in use. If it's plugged in, it'll use outlet power to maintain temp rather than pull power from the batteries.
    • Informative x 1
  3. Model S M.D.

    Model S M.D. Ludicrous Radiologist

    Oct 31, 2015
    Houston, TX
    Agree with above, your battery management system is just cooling the battery. Here is a good link for Model S noises: Sounds of Tesla Vehicles | TeslaTap

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